Study on Vibration Control Performance of an STF-TMD Damper

According to the shear thickening effect of shear thickening fluid (STF), this work proposes to use the time-varying damping characteristics of STF to improve the damping effect of traditional tuned mass damper (TMD). Based on the traditional TMD principle, the min(max ω DMF) method is used to find the optimal parameter solution of the frequency ratio and damping ratio of the TMD system. Then, taking the optimal frequency ratio obtained by this method as the fixed frequency ratio of the variable damping TMD and STF-TMD, thus the parameter analysis process of the STF-TMD system is simplified. At the same time, the influence of the physical parameters related to the mass on the damping coefficient of STF-TMD is analyzed based on computational fluid dynamics technology, and the calculation model of the damping coefficient is given based on the STF test data. The result shows that variable damping can improve the damping effect of TMD, and the change of damping in a specific range is similar to that of STF, which proves the feasibility of STF-TMD. Both theory and experiment show that STF-TMD has dramatically improved its vibration reduction performance compared with traditional TMD, so STF-TMD provides a new idea for vibration control of engineering structures.